various colours for use in tropical climates were made in the Soudan by the war correspondent of the Lancet. Two thermometers were placed in wooden boxes, one of which was painted black, the other white; they were left in the sun for one hour, at the end of which time the thermometer in the black box registered 117° F., that in the white 102° F.
In another experiment six thermometers having two parts of new bunting of various colours wrapped round them were hung up exposed to the sun for one hour, with the following results :—
Temp, of the air in shade . . . 91° F. „ thermom. covered with white . 106° „ „ „ „ yellow. 109½° „ „ „ „ red . 100° „ „ „ „ blue . 114° " „ " " light blue 115° „ „ „ „ black . 117°
Ten tin biscuit-boxes painted as below were exposed with thermometers standing up in them on the sides opposite to those turned towards the sun. Temperature of air in the shade, 88° F. They were closed and left for about two hours. They registered as follows :—
- White . . 100° F.
- Yellow . 103½°
- Red . . 104°
- Stone colour 102½°
- Blue . . 106°
- French grey 106½
- Lead colour. 109°
- Dark green. 110½°
- Light green. 109°
- Black . . 114°
Three square tin biscuit-boxes were next painted and whitewashed variously.
